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Heymann Harald -- Non-Carious Cervical Lesions; Causes

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Heymann Harald -- Non-Carious Cervical Lesions; Causes ***Handout*** Non-Carious Cervical Lesions: Causes, Prevention & Treatment Harald O. Heymann, DDS MEd I: Introduction and definitions Abrasion- Abrasion is the pathologic wear of tooth structure due to an abnormal mechanical process (dentifrice/toothbrush, etc.). Erosion- Erosion is the chemical loss of tooth structure from chronic exposure to acidic materials. Attrition- Attrition is the wear of tooth structure from tooth-to-tooth contact. Abfraction- Abfraction results in non-carious cervical lesions due to tooth flexure and tooth weakening largely induced by parafunctional contact II: Early theories III: Bioengineering factors and causes of NCCLs A. Tooth flexure and the role of parafunction -Numerous finite element analysis (FEA) studies reveal tooth flexural stresses are concentrated in the cervical region. -Parafunction (bruxism, clenching, traumatic occlusion) is the primary source of the flexural stresses. B. Tooth morphology factors C. Erosion D. Stress corrosion E. Abrasion IV: Epidemiological studies A: Archaeological specimens B: Isolated populations with no access to modern oral hygiene tools C: Occlusion studies V: Existence in animals (carnivores) VI: Clinical observations VII: Treatment of NCCLs VIII: Summary and conclusions: the etiology of NCCLs is multi-factorial SUMMARY: In a landmark article that appeared in the Journal of Esthetic Dentistry in1991, Dr. John Grippo introduced a term called "abfraction."1 This term has been used to describe non- carious cervical lesions that result primarily from the destructive effects of tooth flexure associated with stressful occlusion or parafunction (bruxism, clenching, etc.). Dr. Grippo eloquently described the morphology and proposed mechanism of formation of these lesions and later the importance of contributing co-variables, such as stress corrosion (accelerated loss of tooth structure when flexural stresses occur in the presence of an acidic environment). 2,3 Regrettably, many in dentistry dismissed this notion early on as pure unsubstantiated speculation. As early as 1984, Lee and Eakle theorized the role of tensile stress in the etiology of non-carious cervical lesions in teeth. 4 Interestingly, controversy has persisted among dentists and academicians regarding the validity of this proposed etiology, in spite of mounting evidence that, indeed, tooth flexure plays an important, and probably under- estimated, role in the etiology of non-carious cervical lesions. The very nature of non- carious cervical lesions makes them difficult to study, because what causes the lesions to initially form may or may not be what results in their progression. By the time the lesion is formed, the "smoking gun" may be long gone. As most research reveals, the etiology and progression of non-carious cervical lesions is multi-factorial, including mechanical abrasion and chemical erosion along with the potentially destructive effects of cervical tooth flexure resulting from stressful occlusion. Clearly, once lesions initially are formed and dentin is exposed, any one or all factors can contribute to their progression. Yet, still today, there are those in dentistry who staunchly maintain that toothbrush abrasion is the cause of most of these lesions, and that tooth flexure from stressful occlusion plays no role whatsoever in the etiology of these lesions. If most non-carious cervical lesions are formed by toothbrush abrasion, why is it that we often encounter isolated lesions on a single tooth with no evidence of a lesion on the teeth immediately adjacent? If these lesions are caused by toothbrush abrasion, how is it that non-carious cervical lesions can be found well subgingivally in areas inaccessible to the toothbrush bristle? Occasionally, cervical lesions in patients with periodontal disease and bone loss even are revealed only upon surgical reflection of soft tissue. How also does one explain the results from a study of prehistoric skulls by Dr. Susan McEvoy in which the same types of non-carious cervical lesions that exist in modern-day man were found in the prehistoric specimens- well before the advent of the toothbrush as we know it. 5 Even if one questions the wealth of mounting research, common sense should underscore the contribution that tooth flexure from stressful occlusion makes to the etiology of non-carious cervical lesions. References 1. Grippo JO. Abfractions: A new classification of hard tissue lesions. J Esthet Dent 1991; 3(1):14-19. 2. Grippo JO and Masi JV. Role of engineering factors (BEF) in the etiology of root caries. J Esthet Dent 1991; 3(2):71-76. 3. Grippo JO and Simring M. Dental "erosion" revisited. J Amer Dent Assoc 1995; 126:619- 630. 4. Lee WC and Eakle WS. Possible role of tensile stress in the etiology of cervical erosive lesions of teeth. J Prosthet Dent 1984; 52:374-380. 5. McEvoy SL, et al. Wedge-shaped cervical dental lesions in two prehistoric Native American populations. Amer J Phys Anthropology 1996; Supp 22: 162. Harald O. Heymann, DDS, MEd Professor Department of Operative Dentistry School of Dentistry University of North Carolina Chapel Hill, NC 27599-7450 Tel. (919) 537-3985 FAX (919) 537-3990 email: [email protected] .
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